From where I come from, the temperatures outside are pretty decent for nepenthes highlanders right now. Days around 80 or so, nights at like 55F. Unfortunately, the insulation is very good in the sense the apartment is still warm at night. My highland tank rarely gets to 60s in the past few days. Yesterday I was trying something different...use a humidifier...a fan a bit far away and trying to see if it would drop temps. Inspite of the fact that the windows are open, night temp was like 60F or something, apparently I could only manage 69F. Summer is really a scary 3-4 months for me as I wait and hope for the arrival of winter again. Although, I have a crazy idea of trying to use my air conditioner along with the humidifier this season. I don't think my villosa will appreciate the temps this summer if I don't intervene.